The Jena Monitor performance metrics information are rolled up from the performance information from all the individual monitored queries.
Visually, the Jena Monitor objects structure is like the following:

Monitor Operations

Child MBeans

This section gathers information regarding MBeans that are contained within this monitor

Jena Query objects

An instance of a monitored query. A JMX object is created for each query, identified by the query it monitors. The JMX object will monitor and gather performance information of all the executions of this SPARQL query. When a query processing has finished it will record the duration and rollup metrics.

Operations

Jena Problems

When the execution of a SPARQL query exceeds the threshold defined in the Jena Monitor, a Problem SPARQL object is created. This object provides information that uniquely identifies the SPARQL query execution that exceeded the threshold. The generated JMX object follows the convention:

Where name matches the one of the SPARQL Query monitor object of which a execution originated this problem. A different problem object instance (with different ID) will be created each time the execution of the query exceeds the defined threshold.